Several factors influence the results of the dissolved oxygen analyzer

The dissolved oxygen electrode can be used to measure the dissolved oxygen content in the aqueous solution of the tested sample in the field or laboratory. Since dissolved oxygen is one of the main indexes of water quality, dissolved oxygen electrode can be widely used for measuring dissolved oxygen content in various situations, especially in aquaculture water, photosynthesis, respiration and field measurement. In assessing the ability of streams and lakes to support living organisms, a biochemical oxygen demand test (BOD) is performed to measure the oxygen-consuming aqueous solution of a sample containing organic matter as it becomes stale and to determine the relationship between the concentration of dissolved oxygen and the temperature of the sample aqueous solution.

The oxygen content of water depends mainly on the temperature, with hot water having a lower oxygen concentration than cold water. But high levels of dissolved oxygen can be harmful to plants and animals. Therefore, as described below, consider that measurements using dissolved oxygen can be affected by certain factors.

1. Environmental impact. Proper dissolved oxygen is essential for good water quality and is required by all life forms. Natural water purification processes require the right amount of oxygen to provide aerobic life forms. If the oxygen content of water is less than 5.0mg/L, aquatic life will not survive. The lower the concentration, the more difficult, if the oxygen level is less than 1-2mg/L for several hours, it will lead to the death of a large number of aquatic life.

2. Application situation. Lysometer can be used to measure and monitor processes in which oxygen content affects reaction rate, process efficiency or environment: e.g. aquaculture, biological reactions, environmental testing (lakes, streams, oceans), water/wastewater treatment.

3. Temperature compensation. For standard dissolved oxygen measurements, temperature affects the solubility and diffusion rate of oxygen, so temperature compensation must be performed.

4. Salinity correction. The presence of dissolved salts limits the amount of oxygen that can be dissolved in the water. The relationship between oxygen concentration and partial pressure varies with the salinity of each sample solution. Therefore, most oximeters can manually adjust salinity to correct for changes in ions caused by different concentrations.